I was reading how lasers work and it said that when you provide charge to an electron it gets excited and moves to an unstable higher state, and after trying to get into an stable state it looses energy in the form of a photon(The first question is from this part), but if we are continuously providing energy to the electron(like, we are keeping the button pressed) then shouldn’t the electron keep itself in the unstable state unless we switch off the button?
2) Mechanical wave oscillate due to physics, but the electromagnetic waves oscillate due to electro magnetic field(From the answers – [https://www.reddit.com/r/explainlikeimfive/comments/l8jdan/comment/gldh94z/?utm_source=share&utm_medium=web2x&context=3](https://www.reddit.com/r/explainlikeimfive/comments/l8jdan/comment/gldh94z/?utm_source=share&utm_medium=web2x&context=3)) but if they are mutually producing each other as an effect of each other, do they have the efficiency of 1? like, light in vacuum travels endlessly and we are able to receive radio waves from so far away in space, so does oscillation not consume any energy(The answers on the internet are very vague, some say they loose energy by 1/r2 where r is amplitude, the other said that in vacuum they can travel forever in theory)?
In: 1
? Waves are complicated? Is the question asking how do waves remain energized? Well EM will travel forever until it runs into something that absorbs it, the intensity is what we actually measure, and this intensity decreases with the inverse square law ? As for lasers, essentially a photon forces an electron down an energy level and results in the stimulated emission of two identical photos?
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